Planck Galactic Cold Clumps at High Galactic Latitude-a Study with CO Lines
文献类型：期刊论文
| 作者 | Xu, Fengwei27,28; Wu, Yuefang27,28; Liu, Tie25,26; Liu, Xunchuan27,28; Zhang, Chao23,24,28; Esimbek, Jarken21,22 ; Qin, Sheng-Li23,24; Li, Di19,20; Wang, Ke27; Yuan, Jinghua18
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2021-10-01 |
| 卷号 | 920期号:2页码:29 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ac1686 |
| 通讯作者 | Xu, Fengwei(fengwei.astro@pku.edu.cn) |
| 英文摘要 | Gas at high Galactic latitude is a relatively little noticed component of the interstellar medium. In an effort to address this, 41 Planck Galactic Cold Clumps at high Galactic latitude (HGal; divide b divide > 25 degrees) were observed in (CO)-C-12, (CO)-C-13, and (CO)-O-18 J = 1-0 lines, using the Purple Mountain Observatory 13.7 m telescope. (CO)-C-12 (1-0) and (CO)-C-13 (1-0) emission was detected in all clumps, while (CO)-O-18 (1-0) emission was only seen in 16 clumps. The highest and average latitudes are 71.degrees 4 and 37.degrees 8, respectively. Fifty-one velocity components were obtained, and then each was identified as a single clump. Thirty-three clumps were further mapped at 1 ' resolution, and 54 dense cores were extracted. Among dense cores, the average excitation temperature T (ex) of (CO)-C-12 is 10.3 K. The average line widths of thermal and nonthermal velocity dispersions are 0.19 and 0.46 km s(-1), respectively, suggesting that these cores are dominated by turbulence. Distances of the HGal clumps given by Gaia dust reddening are about 120-360 pc. The ratio of X (13)/X (18) is significantly higher than that in the solar neighborhood, implying that HGal gas has a different star formation history compared to the gas in the Galactic disk. HGal cores with sizes from 0.01 to 0.1 pc show no notable Larson's relation, and the turbulence remains supersonic down to a scale of slightly below 0.1 pc. None of the HGal cores that bear masses from 0.01 to 1 M (circle dot) are gravitationally bound, and all appear to be confined by outer pressure. |
| WOS关键词 | MOLECULAR CLOUDS ; CARBON-MONOXIDE ; STAR-FORMATION ; H-I ; INFRARED CIRRUS ; DARK CLOUDS ; DENSE CORES ; GAS ; TRANSLUCENT ; TURBULENCE |
| 资助项目 | NSFC[11433008] ; NSFC[12033005] ; NSFC[11988101] ; NSFC[11373009] ; NSFC[11503035] ; NSFC[11573036] ; China Ministry of Science and Technology[2012CB821800] ; National Key R&D Program of China[2017YFA0402600] ; National Aeronautics and Space Administration[80NM0018D0004] ; National Science Foundation[ACI-1440620] ; [CONICYT/PCI/REDI170243] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000709102800001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | NSFC ; China Ministry of Science and Technology ; National Key R&D Program of China ; National Aeronautics and Space Administration ; National Science Foundation |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4307]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | Xu, Fengwei |
| 作者单位 | 1.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA 2.Chinese Acad Sci, Key Lab Radio Astron, 8 Yuanhua Rd, Nanjing 210034, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 5.Natl Taiwan Univ NTU, Taipei, Taiwan 6.Acad Sinica, Inst Astron & Astrophys, 11F AS NTU Astron Math Bldg,1,Sect 4,Roosevelt Rd, Taipei 10617, Taiwan 7.Univ Helsinki, Dept Phys, POB 64, FI-00014 Helsinki, Finland 8.Kyung Hee Univ, Sch Space Res, 1732 Deogyeong Daero, Yongin 17104, Gyeonggi Do, South Korea 9.King Abdulaziz Univ, Fac Sci, Astron Dept, POB 80203, Jeddah 21589, Saudi Arabia 10.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany |
| 推荐引用方式 GB/T 7714 | Xu, Fengwei,Wu, Yuefang,Liu, Tie,et al. Planck Galactic Cold Clumps at High Galactic Latitude-a Study with CO Lines[J]. ASTROPHYSICAL JOURNAL,2021,920(2):29. |
| APA | Xu, Fengwei.,Wu, Yuefang.,Liu, Tie.,Liu, Xunchuan.,Zhang, Chao.,...&Ju, Binggang.(2021).Planck Galactic Cold Clumps at High Galactic Latitude-a Study with CO Lines.ASTROPHYSICAL JOURNAL,920(2),29. |
| MLA | Xu, Fengwei,et al."Planck Galactic Cold Clumps at High Galactic Latitude-a Study with CO Lines".ASTROPHYSICAL JOURNAL 920.2(2021):29. |
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